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Strenuous (7)

Ross

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7

6*

arduous

'strenuous' is the definition.
(synonyms)

This is all the clue.

(Other definitions for arduous that I've seen before include "Steep; laborious" , "Demanding great effort" , "Gruelling, strenuous" , "Requiring much effort" , "Requiring great effort" .)

I've seen this clue in the L.A. Times Sunday, the King Feature Syndicate, the Wall Street Journal, the Evening Standard, The Mirror, The Guardian, The Times and The Telegraph.
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